Artesunate suppresses RANKL-induced osteoclastogenesis through inhibition of PLCγ1-Ca²⁺-NFATc1 signaling pathway and prevents ovariectomy-induced bone loss

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• 作者：Xiangzhou Zeng^a ; ^b ; Yueyang Zhang^a ; Song Wang^c ; Keng Wang^a ; Lei Tao^a ; Min Zou^a ; Nana Chen^a ; Jiake Xu^d ; Shuwen Liu^a ; ^{liusw@smu.edu.cn} ; Xiaojuan Li^a ; ^{lixiaoj@smu.edu.cn}
• 关键词：Art ; artesunate ; RANKL ; receptor activator of nuclear factor-κB (NF-κB) ligand ; M-CSF ; macrophage colony-stimulating factor ; TRAP ; tartrate-resistant acid phosphatase ; TRAF6 ; tumor necrosis factor receptor associated factor 6 ; IκB ; inhibitor of nuclear factor-κB ; NF-κB ; nuclear factor-κB ; NFATc1 ; nuclear factor of activated T cells c1 ; Micro-CT ; microcomputer tomography
• 刊名：Biochemical Pharmacology
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：124
• 期：Complete
• 页码：57-68
• 全文大小：3304 K
• 卷排序：124

文摘

Bone lytic diseases including osteoporosis, rheumatoid arthritis, and bone metastatic tumors affect hundreds of millions people worldwide. Targeting over-activated osteoclasts as an anti-resorptive treatment becomes an important strategy to treat osteolytic diseases. Artesunate is a compound derived from artemisinin (qinghaosu) and has been used to treat malaria and rheumatoid arthritis clinically in China, but its role in osteolysis is unknown. Here, we found that artesunate could suppress RANKL-induced osteoclastogenesis and bone resorption from 1.56 to 12.5 μM. Artesunate obviously reduced RANKL-induced NF-κB-luc activity at 50 μM, but had no effects on RANKL-induced NF-κB activation (NF-κB luciferase activity, IκB-α degradation and nuclear NF-κB p65 protein level) from 3.125 to 12.5 μM in pre-osteoclastic RAW264.7 cells. Interestingly, artesunate could significantly inhibit RANKL-induced NFATc1 activation measured by NFAT luciferase activity, NFATc1 mRNA and nuclear NFATc1 protein levels from 3.125 to 12.5 μM. Further study revealed that artesunate inhibited RANKL up-regulated PLCγ1 activation, intracellular calcium, and calcineurin (PP2B-Aα) protein expression from 3.125 to 12.5 μM. In addition, the NFATc1 targeted osteoclast-specific genes expression including cathepsin K, MMP-9, and TRAP was reduced by artesunate. Finally, we showed that artesunate was able to reverse the bone loss in an ovariectomized mouse model in vivo accompanied with reduced RANKL, RANKL/OPG, and TRAP-5b levels. This study indicates that artesunate inhibits RANKL-induced osteoclastogenesis and bone loss by inhibiting PLCγ1-Ca2+-calcineurin-NFATc1 pathway. Collectively, our data suggest that artesunate is a potential treatment option against RANKL-mediated osteolytic bone disease.